Idiom
Which statement regarding the mammalian heart is correct?

In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs
Oxygen-loaded blood moves only through the right side of the heart
When the right atrium contracts, it forces blood into the left atrium
Blood is pumped from the heart via the atria

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Idiom
To be above board

They have no debts
To be honest in any business deal
To have a good height
To try to be beautiful
None of these

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